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Handicap calculator
Paste your latest Score Differentials, up to 20 - the per-round figures your club's app or England Golf record already shows - and this works out your Handicap Index the World Handicap System way. With 20 scores that is the lowest 8, averaged, rounded to the nearest tenth. With fewer, it uses the Rule 5.2a table.
The Golfer
Dave Hartley
HANDICAP 12.4
Sandy Bay Golf Club
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Based on Rules 5.2a and 5.2b of the R&A Rules of Handicapping.
This is the uncapped calculation. Your club's system may apply a cap against your Low Handicap Index (Rule 5.8).
What a Score Differential already carries
The differential is the adjusted figure, not your gross score: it is your adjusted gross score measured against the Course Rating and Slope Rating of the tees you played, with the day's playing-conditions adjustment included. That is why this tool asks for differentials, not scores: Rule 2 builds the course into the number, and the conversion from a card you kept needs the PCC figure for that day, which only the system knows. Your club's app shows the differential for every accepted round.
Why the lowest 8 of 20, and what happens with fewer
Rule 5.2b averages the lowest 8 of your most recent 20 differentials and rounds to the nearest tenth. Averaging only your best rounds is what makes the index measure demonstrated ability and not your worst Saturdays; taking them from the last 20 is what makes it move with your current game. A single disaster barely registers; a genuine run of form does.
New to the system, or only a few rounds in? Rule 5.2a covers 3 to 19 scores. With 8 scores, for example, it averages your lowest 2. With 3 it takes your lowest 1 and subtracts 2.0, with 4 the lowest 1 less 1.0, and with 6 the lowest 2 less 1.0. The tool follows that table and tells you when it has.
What this tool does not do
Two limits to know. It doesn't apply Rule 5.8's caps, because they hinge on your Low Handicap Index, which your club's record tracks - so a long-standing low index may see the official number sit above this one. And it doesn't convert raw scores into differentials, because that needs each round's Course Rating, Slope Rating and playing-conditions adjustment.
When the number comes back, what counts as a good handicap puts it in context, and how a handicap is calculated walks the whole mechanism.
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of differentials entered
An index needs at least scores. Enter your most recent differentials, up to 20.
Lowest of your differentials
Average of the lowest = , rounded to the nearest tenth.
With fewer than 20 scores the rules take off that average.
Fewer than 20 scores, so this follows the table in Rule 5.2a. Your index settles once you have 20.
Only the first differentials you entered were used - the rule averages the lowest 8 of the most recent 20, so enter exactly your 20 most recent for the official figure.
of differentials entered
An index needs at least scores. Enter your most recent differentials, up to 20.
Lowest of your differentials
Average of the lowest = , rounded to the nearest tenth.
With fewer than 20 scores the rules take off that average.
Fewer than 20 scores, so this follows the Rule 5.2a table. Your index settles once you have 20.
Only the first differentials you entered were used - the rule averages the lowest 8 of the most recent 20, so enter exactly your 20 most recent for the official figure.
The calculation is Rule 5 of the Rules of Handicapping: with 20 scores, average the lowest 8 and round to the nearest tenth (5.2b). With 3 to 19 scores, the table in Rule 5.2a picks fewer scores and sometimes takes a small adjustment off. The result is the uncapped index your record's arithmetic produces.
It deliberately leaves out what only your club's system knows: the Rule 5.8 caps, and the conversion from raw cards into differentials.
Written by Craig Fearn, The Golf Gift Co. Last updated .